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I find machine sanding is a world apart from hand sanding whe it comes to plastics. If you really want to use a belt sander to shape, rough the surface with a rasp before you continue on hand...

A little tip...
Sand to about 1000 grit, wipe everything clean with a damp cloth, then pass a propane/butane torch over them. Voila! smooth as glass. Take practice to get it right without...